<template>
  <div>
      <div v-for="(item,i) in arr" :key="i">
          <input type="checkbox" v-model="num" :value="item">
          <span>{{item}}</span>
      </div>
   
 <p>你选中的元素, 累加的值和为: {{ thenum }}</p>
       
      
  </div>
</template>

<script>
export default {
        data() {
            return {
                arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
                num: [],
            }
        },
        computed:{
            thenum(){
                return this.num.reduce((sum,val)=>{
                    return(sum += val)
                },0)
            }
        }
}
</script>

<style>

</style>